The invention discloses a preparation method of a micro-nano silver /
chitosan composite
antibacterial agent. According to the preparation method, on the basis of the characteristic of rapid
microwave heating,
silver nitrate is taken as a silver source, water is taken as a
solvent, and spherical micro-nano
silver particles are successfully prepared in a shorter time with direct utilization of reducibility of PVP (
polyvinylpyrrolidone) in preparation under the condition of only PVP addition without other reducing agents; the spherical micro-nano
silver particles are loaded to
chitosan polymers bycoordination, the micro-nano silver /
chitosan composite
antibacterial agent is prepared and added to antibacterial body care products, and antibacterial performance is adjusted by changing adding quantity and strain categories of the composite
antibacterial agent. The preparation technology is not reported, compared with a conventional
chemical reduction method, the method has advantages that a synthetic reaction is performed rapidly, other reducing agents are not needed, the preparation technology is simplified, raw materials are saved, and water serving as the
solvent is cleaner, so that onerapid, simple, efficient and environment-friendly method is provided for preparation of micro-nano silver.